Decomposition of N-nitrosamines, and concomitant release of nitric oxide by Fenton reagent under physiological conditions.

作者: K. Hiramoto , Y. Ryuno , K. Kikugawa

DOI: 10.1016/S1383-5718(02)00168-7

关键词:

摘要: Abstract N-Nitrosodimethylamine (NDMA) in phosphate buffer was rapidly decomposed by Fenton reagent composed of H2O2, and Fe(II) ion. Electron spin resonance (ESR) studies using 5,5-dimethyl-1-pyrroline N-oxide (DMPO) showed that characteristic four line 1:2:2:1 ESR signals due to the DMPO-OH adduct formed on treatment DMPO with disappeared presence NDMA, N-nitrosodiethylamine (NDEA), suggesting interaction N-nitrosamines reagent. Treatment generated nitric oxide (NO) as estimated technique cysteine–Fe(II), N-methyl- d -glucaminedithiocarbamate (MGD)–Fe(II) complexes. Characteristic 3, single 2 cysteine–Fe(II)–NO, cysteine–Fe(II)–2 NO complexes, respectively, three MGD–Fe(II)–NO were observed. Considerable amount liberated determined NO2−, final oxidation product reaction dissolved oxygen aqueous medium. Spontaneous release a small from observed only incubation neutral buffers. Above results indicate accompanying concomitant contact reactive species.

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